Abstract
The technology of cooling by boiling has been gaining attention in the fields of hardening of metals, nuclear reactors or superconducting coils. The boiling heat transfer involves not only transportation of sensible heat but also the latent heat due to gas-liquid phase transition, and therefore, it produces high heat transfer rates. The purpose of this on-going study is to elucidate the effects on the cooling by boiling heat transfer when a frost-layer coating is formed on the cooling surface. We are currently experimentally investigating the boiling heat transfer characteristics of copper balls in the diameter range of 20 to 30 mm in saturated liquid nitrogen at atmospheric pressure. The experimental results show that a frost layer coating on the cooling surface has a remarkable effect on the cooling curves of a copper surface.
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